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Finding the Fourth Proportional to 387,020.40, 579,218.40 and 339,781.20

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Solution

The fourth proportional to 387,020.40, 579,218.40 and 339,781.20 is: 508,519.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,020.40 : 579,218.40 = 339,781.20 : x
  2. Step 2: Convert to fraction form
    387,020.40/579,218.40 = 339,781.20/x
  3. Step 3: Cross multiply
    387,020.40x = 579,218.40 × 339,781.20
  4. Step 4: Simplify right side
    387,020.40x = 196,807,523,014.08
  5. Step 5: Solve for x
    x = 196,807,523,014.08/387,020.40
  6. Step 6: Final answer
    x = 508,519.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.